Under Armour Men's CoolSwitch Run Tights 79% Polyester/21% Elastane Imported UA CoolSwitch brief uses an exclusive coating on the inside that pulls heat away from your skin, so you actually feel cooler Tough, lightweight HeatGear fabric, with all the performance benefits of UA Compression Built-in brief for added support 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast